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plug in the notebook, turn on the projector (making sure it is set on the HDMI port), turn on the notebook and see if WIndows 7 picks up the projector. What are the numbers in the NV57 xxx? Is this notebook using the Intel GPU (like a core i3)? then the cabling/projector is probably just fine.the type of HDMI cable being used I wouldn't think really matters in this case (though you could always run a shorter HDMI cable directly from the projector to the notebook if nothing else works). I wouldn't start tearing down the building. Before I get on a ladder and remove a ceiling tile to connect it directly to the projector, is there any possibility that I'm using too new of an HDMI cable that the laptop won't recognize? Or is that even an issue? I always thought HDMI regardless of revision, was backwards compatible? I even did a factory reset using the Gateway system restore and even after that it still did not work.

After tightening that, and then reconnecting the Dell latitude, it worked flawlessly on the projector! However, when connecting the gateway, no matter what I tried, the projector would not display anything from that laptop. After inspecting the wall jack, I discovered that the HDMI cable that was in the wall had slightly come loose from the jack. I was using "Win Key" + "P" to change the modes. The issue was that when connecting both of the laptops to the HDMI port, neither laptop would display anything on the projector. The first laptop is a Dell Latitude with Windows 10, and the second one is a Gateway NV57xxx with Windows 7. Which is where both laptops have been plugging into. Then another HDMI cable runs from the panel box to the actual wall jack. The HDMI cable runs through the ceiling to a panel box in a closet. First off, the projector is a newer BenQ MS517 projector mounted overhead.

I was asked to help diagnose a recent problem with why two computers would not connect to an overhead project with the HDMI cable/port in the wall.